Finding the Fourth Proportional to 9,141.72, 12,615.32 and 5,415.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,141.72 : 12,615.32 = 5,415.72 : x
2. Step 2: Convert to fraction form
   9,141.72/12,615.32 = 5,415.72/x
3. Step 3: Cross multiply
   9,141.72x = 12,615.32 × 5,415.72
4. Step 4: Simplify right side
   9,141.72x = 68,321,040.83
5. Step 5: Solve for x
   x = 68,321,040.83/9,141.72
6. Step 6: Final answer
   x = 7,473.54